Last name Baaja (Bajer 
, Baaja 
) , in the world, is quite a common family name. The last name Baaja is habitual in Czechia, where it is quite a common surname, Poland, where it is quite a rare surname, and Paraguay. In absolute terms, the name is most common in Poland, Czechia, and Germany. Likewise, Baaja is the forename as well as the last name.